JP2023116290A - Storage battery deterioration diagnosis system - Google Patents

Storage battery deterioration diagnosis system Download PDF

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JP2023116290A
JP2023116290A JP2022019018A JP2022019018A JP2023116290A JP 2023116290 A JP2023116290 A JP 2023116290A JP 2022019018 A JP2022019018 A JP 2022019018A JP 2022019018 A JP2022019018 A JP 2022019018A JP 2023116290 A JP2023116290 A JP 2023116290A
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storage battery
current
voltage
deterioration diagnosis
measured
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正稔 大島
Masatoshi Oshima
孝 渡部
Takashi Watabe
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Kawamura Electric Inc
Tokai National Higher Education and Research System NUC
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Kawamura Electric Inc
Tokai National Higher Education and Research System NUC
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Abstract

To provide a storage battery deterioration diagnosis system in which upon supplying a measurement current, a storage battery does not become over-discharged, or over-recharged.SOLUTION: A deterioration diagnosis unit 4 is configured to: measure a voltage of a storage battery cell 1 before supplying a measurement current to the storage battery cell 1; supply a negative polarity pulsating current, as the measurement current, to the storage battery cell 1 when the measured voltage of the storage battery cell 1 exceeds a first threshold near an upper limit in a prescribed operation voltage range, on the other hand, when the voltage of the storage battery cell 1 is under a second threshold near a lower limit in the prescribed operation voltage range, supply a positive polarity pulsating current, as the measurement current, to the storage battery cell 1; and when the voltage of the storage battery cell 1 stays between the first threshold and second threshold, supply, as the measurement current, a prescribed AC current to the storage battery cells 1, and thereby perform control so that the voltage of the storage battery cell 1 varies within the operation voltage range.SELECTED DRAWING: Figure 1

Description

本発明は、たとえば非常用電源や余剰電力の蓄電等に使用される蓄電池の劣化状態を診断するための蓄電池の劣化診断システムに関するものである。 The present invention relates to a storage battery deterioration diagnosis system for diagnosing a deterioration state of a storage battery used for, for example, an emergency power source or a storage of surplus electric power.

従来、たとえば非常用電源や余剰電力の蓄電等に使用される蓄電池は、劣化すると蓄電可能な電力が減少し、その機能を十分に発揮できなくなることから、ある程度劣化が進行すると交換する必要がある。そこで、蓄電池の劣化状態を診断するための劣化診断システムとして、蓄電池に計測電流（交流電流）を供給してインピーダンスを計測し、計測したインピーダンス値から蓄電池の劣化状態を診断するというものが考案されている。 Conventional storage batteries, which are used for emergency power sources and storage of surplus power, for example, lose their ability to store enough power when they deteriorate, so they need to be replaced when they deteriorate to a certain extent. . Therefore, as a deterioration diagnosis system for diagnosing the deterioration state of a storage battery, a method has been devised that supplies a measurement current (alternating current) to the storage battery, measures the impedance, and diagnoses the deterioration state of the storage battery from the measured impedance value. ing.

たとえば特許文献１に記載の劣化診断システムでは、計測電流を蓄電池に供給する際、周波数を変更して周波数毎のインピーダンスを計測し、周波数特性曲線にもとづいて虚数部が０となるインピーダンスを求め、このインピーダンスにもとづいて蓄電池の劣化状態を判断している。 For example, in the deterioration diagnosis system described in Patent Document 1, when supplying a measurement current to a storage battery, the frequency is changed to measure the impedance for each frequency, and the impedance at which the imaginary part is 0 is obtained based on the frequency characteristic curve. The deterioration state of the storage battery is determined based on this impedance.

特開２００７－３３３４９４号公報JP 2007-333494 A

しかしながら、上記特許文献１に記載されている劣化診断システムでは、蓄電池の電圧が運用電圧範囲の下限、若しくは、上限に近い状況にあると、計測電流を供給した際に蓄電池が過放電、若しくは、過充電となってしまうという問題がある。 However, in the deterioration diagnosis system described in Patent Document 1, when the voltage of the storage battery is close to the lower limit or the upper limit of the operating voltage range, the storage battery is over-discharged or over-discharged when the measured current is supplied. There is a problem of overcharging.

そこで、本発明は、上記問題に鑑みなされたものであって、計測電流を供給した際に蓄電池が過放電、若しくは、過充電となることのない蓄電池の劣化診断システムを提供しようとするものである。 SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above problems, and it is an object of the present invention to provide a storage battery deterioration diagnosis system that prevents the storage battery from being over-discharged or over-charged when a measurement current is supplied. be.

上記目的を達成するために、本発明のうち請求項１に記載の発明は、蓄電池に計測電流を供給する電流供給部、前記蓄電池の電圧を計測する電圧計測部、及び供給した計測電流と計測電流の供給時の電圧とから前記蓄電池の内部のインピーダンスを算出して前記蓄電池の劣化状態を診断する劣化診断部を有する蓄電池の劣化診断システムであって、前記劣化診断部は、前記蓄電池に計測電流を供給する前に、前記蓄電池の電圧を計測するとともに、当該計測した前記蓄電池の電圧が所定の運用電圧範囲における上限寄りの第１閾値を超えていると、負極性脈流を計測電流として前記蓄電池に供給する一方、前記蓄電池の電圧が前記運用電圧範囲における下限寄りの第２閾値を下回っていると、正極性脈流を計測電流として前記蓄電池に供給し、さらに、前記蓄電池の電圧が前記第１閾値と前記第２閾値との間にあると、所定の交流電流を計測電流として前記蓄電池に供給することにより、前記蓄電池の電圧が前記運用電圧範囲内で変動するように制御することを特徴とする。
請求項２に記載の発明は、請求項１に記載の発明において、前記蓄電池は、複数の蓄電池セルが直列接続されて構成され、前記劣化診断部が、複数の前記蓄電池セルの劣化状態を診断するとともに、前記電流供給部及び前記電圧計測部が、前記蓄電池セル毎に設けられており、前記劣化診断部は、前記蓄電池セル毎に供給する計測電流の種類を決定することを特徴とする。
請求項３に記載の発明は、請求項１に記載の発明において、前記蓄電池は、複数の蓄電池セルが直列接続されて構成され、前記劣化診断部が、複数の前記蓄電池セルの劣化状態を診断するとともに、前記電圧計測部は前記蓄電池セル毎に設けられている一方、前記電流供給部は１つしか設けられておらず、前記劣化診断部は、前記蓄電池に計測電流を供給する前に、全ての前記蓄電池セルの電圧を計測するとともに、計測した電圧が前記第１閾値を超えている前記蓄電池セルが１つでもあると、負極性脈流を計測電流として全ての前記蓄電池セルに供給し、計測した電圧が前記第２閾値を下回っている前記蓄電池セルが１つでもあると、正極性脈流を計測電流として全ての前記蓄電池セルに供給することを特徴とする。
なお、本発明に係る正極性脈流とは、プラス側において一定周期で変動する正のバイアス電流であり、負極性脈流とは、マイナス側において一定周期で変動する負のバイアス電流である。 In order to achieve the above object, the invention according to claim 1 of the present invention includes a current supply unit that supplies a measurement current to a storage battery, a voltage measurement unit that measures the voltage of the storage battery, and the supplied measurement current and measurement. A storage battery deterioration diagnosis system having a deterioration diagnosis unit for diagnosing the deterioration state of the storage battery by calculating the internal impedance of the storage battery from the voltage when the current is supplied, wherein the deterioration diagnosis unit measures the storage battery. Before supplying current, the voltage of the storage battery is measured, and if the measured voltage of the storage battery exceeds a first threshold near the upper limit in a predetermined operating voltage range, the negative pulsating current is used as the measurement current. While supplying to the storage battery, when the voltage of the storage battery is below a second threshold near the lower limit in the operating voltage range, a positive pulsating current is supplied to the storage battery as a measured current, and further, the voltage of the storage battery increases If it is between the first threshold and the second threshold, by supplying a predetermined alternating current as a measured current to the storage battery, controlling the voltage of the storage battery to fluctuate within the operating voltage range. characterized by
The invention according to claim 2 is based on the invention according to claim 1, wherein the storage battery is configured by connecting a plurality of storage battery cells in series, and the deterioration diagnosis unit diagnoses deterioration states of the plurality of storage battery cells. In addition, the current supply unit and the voltage measurement unit are provided for each storage battery cell, and the deterioration diagnosis unit determines the type of measurement current to be supplied for each storage battery cell.
The invention according to claim 3 is based on the invention according to claim 1, wherein the storage battery is configured by connecting a plurality of storage battery cells in series, and the deterioration diagnosis unit diagnoses deterioration states of the plurality of storage battery cells. In addition, while the voltage measurement unit is provided for each storage battery cell, only one current supply unit is provided, and the deterioration diagnosis unit, before supplying the measurement current to the storage battery, The voltages of all the storage battery cells are measured, and if there is even one storage battery cell in which the measured voltage exceeds the first threshold, the negative pulsating current is supplied to all the storage battery cells as a measured current. A positive pulsating current is supplied to all the storage battery cells as a measured current when even one of the storage battery cells has a measured voltage lower than the second threshold.
In addition, the positive pulsating current according to the present invention is a positive bias current that fluctuates in a constant cycle on the positive side, and the negative pulsating current is a negative bias current that fluctuates in a constant cycle on the negative side.

本発明によれば、劣化診断部は、蓄電池に計測電流を供給する前に、蓄電池の電圧を計測するとともに、当該計測した蓄電池の電圧が所定の運用電圧範囲における上限寄りの第１閾値を超えていると、負極性脈流を計測電流として蓄電池に供給する一方、蓄電池の電圧が運用電圧範囲における下限寄りの第２閾値を下回っていると、正極性脈流を計測電流として蓄電池に供給し、さらに、蓄電池の電圧が第１閾値と第２閾値との間にあると、所定の交流電流を計測電流として蓄電池に供給することにより、蓄電池の電圧が運用電圧範囲内で変動するように制御する。したがって、たとえ蓄電池の電圧が運用電圧範囲の下限、若しくは、上限に近い状況にあるとしても、計測電流を供給した際に蓄電池が過放電、若しくは、過充電となることがなく、蓄電池の劣化状態を正確に診断可能な蓄電池の劣化診断システムとすることができる。 According to the present invention, the deterioration diagnosis unit measures the voltage of the storage battery before supplying the measurement current to the storage battery, and the measured voltage of the storage battery exceeds the first threshold near the upper limit in the predetermined operating voltage range. While the negative pulsating current is supplied to the storage battery as the measured current, if the voltage of the storage battery is below the second threshold near the lower limit in the operating voltage range, the positive pulsating current is supplied to the storage battery as the measured current. Furthermore, when the voltage of the storage battery is between the first threshold and the second threshold, a predetermined alternating current is supplied to the storage battery as the measured current, thereby controlling the voltage of the storage battery to fluctuate within the operating voltage range. do. Therefore, even if the voltage of the storage battery is close to the lower limit or the upper limit of the operating voltage range, the storage battery will not be over-discharged or over-charged when the measurement current is supplied, and the storage battery will not be overcharged. can be accurately diagnosed as a storage battery deterioration diagnosis system.

蓄電池の劣化診断システムの一例を示した構成図である。1 is a configuration diagram showing an example of a storage battery deterioration diagnosis system; FIG. 計測電圧及び計測電流を供給した際の蓄電池セルでの電圧の波形を示した説明図である。FIG. 4 is an explanatory diagram showing voltage waveforms in storage battery cells when a measured voltage and a measured current are supplied; 計測電流として供給する脈流及び交流の波形図であり、（ａ）は負極性脈流を、（ｂ）は正極性脈流を、（ｃ）は交流を夫々示している。It is a waveform diagram of a pulsating current and alternating current supplied as a measurement current, where (a) shows a negative pulsating current, (b) shows a positive pulsating current, and (c) shows an alternating current.

以下、本発明の一実施形態となる蓄電池の劣化診断システムについて、図面にもとづき詳細に説明する。 DETAILED DESCRIPTION OF THE INVENTION A storage battery deterioration diagnosis system according to an embodiment of the present invention will be described in detail below with reference to the drawings.

図１は、蓄電池の劣化診断システム１０の一例を示した構成図であり、劣化診断システム１０は、直列接続された複数の蓄電池セル１、１・・から構成される蓄電池と、蓄電池セル１に計測電流を供給するために蓄電池セル１毎に設けられる電流供給部２、２・・と、蓄電池セル１の電圧を計測するために蓄電池セル１毎に設けられる電圧計測部３、３・・と、蓄電池セル１、１・・の劣化を診断する劣化診断部４とを備えている。 FIG. 1 is a configuration diagram showing an example of a deterioration diagnosis system 10 for a storage battery. Current supply units 2, 2, . , and a deterioration diagnosis unit 4 for diagnosing deterioration of the storage battery cells 1, 1 .

劣化診断部４は、蓄電池セル１の内部のインピーダンスを算出するインピーダンス演算部６、劣化の診断に係る閾値等を記憶する記憶部７、及び劣化診断部４を制御する診断部ＣＰＵ８等を備えている。そして、診断部ＣＰＵ８は、後述するような制御のもと蓄電池セル１に供給する計測電流の種類を決定し、電流供給部２を制御して蓄電池セル１に計測電流を供給する。 The deterioration diagnosis unit 4 includes an impedance calculation unit 6 that calculates the internal impedance of the storage battery cell 1, a storage unit 7 that stores thresholds and the like for diagnosing deterioration, a diagnosis unit CPU 8 that controls the deterioration diagnosis unit 4, and the like. there is Diagnosis unit CPU 8 determines the type of measurement current to be supplied to storage battery cell 1 under control described later, and controls current supply unit 2 to supply measurement current to storage battery cell 1 .

なお、図１中の矢印Ｉ１は、蓄電池が負荷（図示せず）に供給する放電電流であり、矢印Ｉ２は、電源（図示せず）から供給され蓄電池を充電する電流である。また、矢印ｉ１は、電流供給部２が蓄電池セル１に供給する計測電流であり、５は、負荷及び電源から蓄電池を開放する開閉器を示している。そして、計測電流ｉ１を蓄電池セル１に供給する際には、開閉器５を閉状態にして実施するが、蓄電池セル１の放電電流や充電電流により診断値のばらつきや変動等の影響が出る場合には、開閉器５を開状態としても良い。 Arrow I1 in FIG. 1 indicates a discharge current supplied from the storage battery to a load (not shown), and arrow I2 indicates a current supplied from a power source (not shown) to charge the storage battery. An arrow i1 indicates a measured current supplied to the storage battery cell 1 by the current supply unit 2, and 5 indicates a switch that disconnects the storage battery from the load and the power supply. Then, when supplying the measured current i1 to the storage battery cell 1, the switch 5 is closed, but if the discharge current or charging current of the storage battery cell 1 affects the diagnostic value such as dispersion or fluctuation. Alternatively, the switch 5 may be opened.

ここで、劣化診断システム１０による蓄電池セル１、１・・の診断に係る制御について説明する。図２は、計測電圧及び計測電流を供給した際の蓄電池セル１での電圧の波形を示した説明図である。図３は、計測電流として供給する脈流及び交流の波形図であり、（ａ）は負極性脈流を、（ｂ）は正極性脈流を、（ｃ）は交流を夫々示している。
まず、劣化診断部４は、診断対象となる蓄電池セル１へ計測電流を供給する前に、当該蓄電池セル１の電圧を計測する。そして、計測した蓄電池セル１の電圧が、所定の運用電圧範囲における上限寄りの第１閾値を超えている（たとえば図２中の第１計測電圧である）と、計測電流として所定の交流電流を供給した際、蓄電池セル１の電圧が運用電圧範囲の上限を超えてしまうおそれがある（たとえば図２の波形Ｃ）。そこで、劣化診断部４は、図３（ａ）に示すような正弦波の負極性脈流を計測電流として供給すると決定する。一方、計測した蓄電池１の電圧が、運用電圧範囲における下限（たとえば上限の５０％）寄りの第２閾値を下回っている（たとえば図２中の第２計測電圧である）と、計測電流として所定の交流電流を供給した際、蓄電池セル１の電圧が運用電圧範囲の下限を下回ってしまうおそれがある（たとえば図２の波形Ｂ）。そこで、劣化診断部４は、図３（ｂ）に示すような正弦波の正極性脈流を計測電流として供給すると決定する。また、計測した蓄電池セル１の電圧が、第１閾値と第２閾値との間にある（たとえば図２中の第３計測電圧である）と、蓄電池セル１の電圧が運用電圧範囲の上限を超えたり下限を下回ったりするおそれがない（たとえば図２の波形Ａ）ため、図３（ｃ）に示すような所定の交流電流を計測電流として供給すると決定する。 Here, control related to diagnosis of the storage battery cells 1, 1, . . . by the deterioration diagnosis system 10 will be described. FIG. 2 is an explanatory diagram showing voltage waveforms in the storage battery cell 1 when the measured voltage and the measured current are supplied. FIG. 3 is a waveform diagram of a pulsating current and an alternating current supplied as a measurement current, where (a) shows a negative pulsating current, (b) shows a positive pulsating current, and (c) shows an alternating current.
First, the deterioration diagnosis unit 4 measures the voltage of the storage battery cell 1 before supplying the measurement current to the storage battery cell 1 to be diagnosed. Then, when the measured voltage of the storage battery cell 1 exceeds the first threshold near the upper limit in the predetermined operating voltage range (for example, the first measured voltage in FIG. 2), a predetermined alternating current is used as the measured current. When supplied, the voltage of the storage battery cell 1 may exceed the upper limit of the operating voltage range (for example, waveform C in FIG. 2). Therefore, the deterioration diagnosis unit 4 determines to supply a sinusoidal negative pulsating current as shown in FIG. 3(a) as the measurement current. On the other hand, when the measured voltage of the storage battery 1 is below the second threshold (for example, the second measured voltage in FIG. 2) near the lower limit (for example, 50% of the upper limit) in the operating voltage range, the measured current is specified is supplied, the voltage of the storage battery cell 1 may fall below the lower limit of the operating voltage range (for example, waveform B in FIG. 2). Therefore, the deterioration diagnosis unit 4 determines to supply a sinusoidal positive pulsating current as the measurement current as shown in FIG. 3(b). Also, when the measured voltage of the storage battery cell 1 is between the first threshold and the second threshold (for example, the third measured voltage in FIG. 2), the voltage of the storage battery cell 1 exceeds the upper limit of the operating voltage range. Since there is no risk of exceeding or falling below the lower limit (for example, waveform A in FIG. 2), it is decided to supply a predetermined alternating current as shown in FIG. 3(c) as the measurement current.

それから、劣化診断部４は、電流供給部２を制御して上記決定した種類の計測電流を蓄電池セル１に供給する。このとき蓄電池セル１の電圧は、負極性脈流が供給されると下限側（図２中の波形Ｃから波形Ａ側）へ移動する一方、正極性脈流が供給されると上限側（図２中の波形Ｂから波形Ａ側）へ移動して、運用電圧範囲内で変動することになる。したがって、計測電流の供給に伴い、蓄電池セル１が過放電となったり、過充電となったりしない。 Then, the deterioration diagnosis unit 4 controls the current supply unit 2 to supply the storage battery cell 1 with the determined type of measurement current. At this time, when the negative pulsating current is supplied, the voltage of the storage battery cell 1 moves to the lower limit side (from waveform C to the waveform A side in FIG. 2). 2), and fluctuates within the operating voltage range. Therefore, the storage battery cell 1 is neither over-discharged nor over-charged with the supply of the measured current.

さらに、劣化診断部４は、上記計測電流の供給時における蓄電池セル１の内部のインピーダンスを算出し、当該インピーダンス値から蓄電池セル１の劣化状態を診断する。なお、インピーダンス値にもとづく蓄電池セル１の劣化状態の診断は、たとえば特許文献１に記載されているような従来既知の手法で行えばよい。 Further, the deterioration diagnosis unit 4 calculates the internal impedance of the storage battery cell 1 when the measured current is supplied, and diagnoses the deterioration state of the storage battery cell 1 from the impedance value. The diagnosis of the state of deterioration of the storage battery cell 1 based on the impedance value may be performed by a conventionally known method such as that described in Patent Document 1, for example.

以上のような構成を有する劣化診断システム１０によれば、劣化診断部４は、蓄電池セル１に計測電流を供給する前に蓄電池セル１の電圧を計測するとともに、当該計測した蓄電池セル１の電圧が所定の運用電圧範囲における上限寄りの第１閾値を超えていると、負極性脈流を計測電流として蓄電池セル１に供給する一方、蓄電池セル１の電圧が運用電圧範囲における下限寄りの第２閾値を下回っていると、正極性脈流を計測電流として蓄電池セル１に供給し、さらに、蓄電池セル１の電圧が第１閾値と第２閾値との間にあると、所定の交流電流を計測電流として蓄電池セル１に供給することにより、蓄電池セル１の電圧が運用電圧範囲内で変動するように制御する。したがって、たとえ蓄電池セル１の電圧が運用電圧範囲の下限、若しくは、上限に近い状況にあったとしても、計測電流を供給した際に蓄電池セル１が過放電、若しくは、過充電となることがなく、蓄電池セル１、ひいては蓄電池の劣化状態を正確に診断可能な劣化診断システム１０とすることができる。 According to the deterioration diagnosis system 10 configured as described above, the deterioration diagnosis unit 4 measures the voltage of the storage battery cell 1 before supplying the measurement current to the storage battery cell 1, and measures the measured voltage of the storage battery cell 1. exceeds the first threshold near the upper limit in the predetermined operating voltage range, while supplying the negative pulsating current to the storage battery cell 1 as the measured current, the voltage of the storage battery cell 1 becomes the second threshold near the lower limit in the operating voltage range. If the voltage is below the threshold, a positive pulsating current is supplied to the storage battery cell 1 as a measurement current, and if the voltage of the storage battery cell 1 is between the first threshold and the second threshold, a predetermined alternating current is measured. By supplying the current to the storage battery cells 1, the voltage of the storage battery cells 1 is controlled to fluctuate within the operating voltage range. Therefore, even if the voltage of the storage battery cell 1 is close to the lower limit or the upper limit of the operating voltage range, the storage battery cell 1 will not be over-discharged or over-charged when the measured current is supplied. , the deterioration diagnosis system 10 capable of accurately diagnosing the deterioration state of the storage battery cell 1 and, by extension, the storage battery.

また、蓄電池は、複数の蓄電池セル１、１・・が直列接続されて構成され、劣化診断部４が、複数の蓄電池セル１、１・・の劣化状態を診断する劣化診断システム１０にあって、電流供給部２及び電圧計測部３が蓄電池セル１毎に設けられており、劣化診断部４は、蓄電池セル１毎に供給する計測電流の種類を決定するように構成されている。したがって、蓄電池セル１単位で正確に劣化状態を診断することができ、劣化した蓄電池セル１のみを交換する等の対応をとることができる劣化診断システム１０とすることができる。 Further, the storage battery is configured by connecting a plurality of storage battery cells 1, 1, . , a current supply unit 2 and a voltage measurement unit 3 are provided for each storage battery cell 1 , and a deterioration diagnosis unit 4 is configured to determine the type of measurement current to be supplied to each storage battery cell 1 . Therefore, the deterioration diagnosis system 10 can accurately diagnose the state of deterioration for each storage battery cell, and can take measures such as replacing only the deteriorated storage battery cell 1 .

なお、本発明に係る蓄電池の劣化診断システムは、上記実施形態の態様に何ら限定されるものではなく、劣化診断システムの全体的な構成は勿論、計測電流の供給に係る構成等についても必要に応じて適宜変更することができる。 It should be noted that the deterioration diagnosis system for a storage battery according to the present invention is not limited to the aspect of the above-described embodiment, and not only the overall structure of the deterioration diagnosis system but also the structure related to the supply of the measured current is necessary. It can be changed as appropriate.

たとえば、上記実施形態では、蓄電池セル毎に電流供給部を設けているが、複数の蓄電池セルの充電状態にあまり差異がないような状況を想定するのであれば、複数の蓄電池セルに対して１つしか電流供給部を設けないという構成を採用することも可能である。そのように電流供給部を１つしか設けない劣化診断システムにあっては、計測電流を供給する前に全ての蓄電池セルについて電圧を計測し、電圧が第１閾値を超えている蓄電池セルが１つでもあると、負極性脈流を計測電流として全ての蓄電池セルに供給する一方、電圧が第２閾値を下回っている蓄電池セルが１つでもあると、正極性脈流を計測電流として全ての蓄電池セルに供給するように構成すればよい。このような構成を採用することにより、部品点数を削減することができ、劣化診断システムを安価に構成することができる。
また、上記実施形態では、正弦波の正極性脈流や負極性脈流を供給するとしてるが、一定周期で変動する脈流であれば、たとえば三角波や方形波の脈流といった正弦波の以外の脈流を供給するとしてもよい。 For example, in the above embodiment, a current supply unit is provided for each storage battery cell. It is also possible to employ a configuration in which only one current supply section is provided. In such a deterioration diagnosis system having only one current supply unit, the voltage is measured for all the storage battery cells before supplying the measurement current, and the voltage exceeds the first threshold value for one storage battery cell. If there is even one, the negative pulsating current is supplied to all the storage battery cells as the measured current, while if there is even one storage battery cell whose voltage is below the second threshold, the positive pulsating current is used as the measured current for all the storage battery cells. What is necessary is just to comprise so that it may supply to a storage battery cell. By adopting such a configuration, the number of parts can be reduced, and the degradation diagnosis system can be configured at low cost.
Further, in the above embodiment, positive pulsating current and negative pulsating current of sinusoidal wave are supplied. pulsating current may be supplied.

１・・蓄電池セル、２・・電流供給部、３・・電圧計測部、４・・劣化診断部、６・・インピーダンス演算部、７・・記憶部、８・・診断部ＣＰＵ、１０・・劣化診断システム。 1 storage battery cell 2 current supply unit 3 voltage measurement unit 4 deterioration diagnosis unit 6 impedance calculation unit 7 storage unit 8 diagnosis unit CPU 10 Deterioration diagnosis system.

Claims (3)

蓄電池に計測電流を供給する電流供給部、前記蓄電池の電圧を計測する電圧計測部、及び供給した計測電流と計測電流の供給時の電圧とから前記蓄電池の内部のインピーダンスを算出して前記蓄電池の劣化状態を診断する劣化診断部を有する蓄電池の劣化診断システムであって、
前記劣化診断部は、前記蓄電池に計測電流を供給する前に、前記蓄電池の電圧を計測するとともに、
当該計測した前記蓄電池の電圧が所定の運用電圧範囲における上限寄りの第１閾値を超えていると、負極性脈流を計測電流として前記蓄電池に供給する一方、前記蓄電池の電圧が前記運用電圧範囲における下限寄りの第２閾値を下回っていると、正極性脈流を計測電流として前記蓄電池に供給し、さらに、前記蓄電池の電圧が前記第１閾値と前記第２閾値との間にあると、所定の交流電流を計測電流として前記蓄電池に供給することにより、
前記蓄電池の電圧が前記運用電圧範囲内で変動するように制御することを特徴とする蓄電池の劣化診断システム。 A current supply unit that supplies a measured current to the storage battery, a voltage measurement unit that measures the voltage of the storage battery, and the impedance inside the storage battery is calculated from the supplied measured current and the voltage at the time of supply of the measured current to calculate the impedance of the storage battery. A storage battery deterioration diagnosis system having a deterioration diagnosis unit for diagnosing a deterioration state,
The deterioration diagnosis unit measures the voltage of the storage battery before supplying the measurement current to the storage battery,
When the measured voltage of the storage battery exceeds a first threshold close to the upper limit in the predetermined operating voltage range, negative pulsating current is supplied to the storage battery as a measured current, and the voltage of the storage battery remains within the operating voltage range. If it is below the second threshold near the lower limit in, the positive pulsating current is supplied to the storage battery as the measured current, and the voltage of the storage battery is between the first threshold and the second threshold. By supplying a predetermined alternating current as a measurement current to the storage battery,
A deterioration diagnosis system for a storage battery, characterized in that control is performed so that the voltage of the storage battery fluctuates within the operating voltage range. 前記蓄電池は、複数の蓄電池セルが直列接続されて構成され、
前記劣化診断部が、複数の前記蓄電池セルの劣化状態を診断するとともに、
前記電流供給部及び前記電圧計測部が、前記蓄電池セル毎に設けられており、
前記劣化診断部は、前記蓄電池セル毎に供給する計測電流の種類を決定することを特徴とする請求項１に記載の蓄電池の劣化診断システム。 The storage battery is configured by connecting a plurality of storage battery cells in series,
The deterioration diagnosis unit diagnoses the deterioration state of the plurality of storage battery cells,
The current supply unit and the voltage measurement unit are provided for each storage battery cell,
2. The storage battery deterioration diagnosis system according to claim 1, wherein the deterioration diagnosis unit determines a type of measurement current to be supplied to each of the storage battery cells. 前記蓄電池は、複数の蓄電池セルが直列接続されて構成され、
前記劣化診断部が、複数の前記蓄電池セルの劣化状態を診断するとともに、
前記電圧計測部は前記蓄電池セル毎に設けられている一方、前記電流供給部は１つしか設けられておらず、
前記劣化診断部は、前記蓄電池に計測電流を供給する前に、全ての前記蓄電池セルの電圧を計測するとともに、
計測した電圧が前記第１閾値を超えている前記蓄電池セルが１つでもあると、負極性脈流を計測電流として全ての前記蓄電池セルに供給し、計測した電圧が前記第２閾値を下回っている前記蓄電池セルが１つでもあると、正極性脈流を計測電流として全ての前記蓄電池セルに供給することを特徴とする請求項１に記載の蓄電池の劣化診断システム。 The storage battery is configured by connecting a plurality of storage battery cells in series,
The deterioration diagnosis unit diagnoses the deterioration state of the plurality of storage battery cells,
While the voltage measurement unit is provided for each storage battery cell, only one current supply unit is provided,
The deterioration diagnosis unit measures the voltages of all the storage battery cells before supplying the measurement current to the storage battery,
If there is even one storage battery cell whose measured voltage exceeds the first threshold, negative pulsating current is supplied to all the storage battery cells as a measured current, and the measured voltage falls below the second threshold. 2. The storage battery degradation diagnosis system according to claim 1, wherein, if even one of the storage battery cells is present, positive pulsating current is supplied to all of the storage battery cells as a measured current.
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